Features: 1. Longer wireless transmission distance 2. The receiver comes with a wireless connection, you can synchronize enjoy your karaoke, without interference, freedom to adjust the volume 3. Built-in over-capacity polymer battery 400Mah. A single Charge, can always use more than 12 hours, long battery life 4. Selection of high-quality materials, micro-USB charging port 5. Super anti-whistle features 6. As long as there is power coupling interface or microphone audio input interface of the receiver can be inserted and KTV wireless public address functionality 7. Widely used: Teaching, tour guide, sales promotion, lectures, meetings, karaoke, fans singing and so on